package com.chanzany.interpreter;

/**
 * @Author ChanZany
 * @Date 2021/10/20 13:23
 * @Version 1.0
 */
public class Client {
    public static void main(String[] args) {
        //创建环境对象
        Context context = new Context();
        //创建多个变量对象
        Variable a = new Variable("a");
        Variable b = new Variable("b");
        Variable c = new Variable("c");
        Variable d = new Variable("d");
        //将变量存储到环境对象中
        context.assign(a, 1);
        context.assign(b, 2);
        context.assign(c, 3);
        context.assign(d, 4);
        //获取抽象语法树 a-((b-c)+d)
        AbstractExpression expression = new Minus(a, new Plus(new Minus(b, c), d));
        int result = expression.interpret(context);
        System.out.println(expression + " = " + result);
    }
}
